Apache License 2.0

Copyright (c) ClickHouse, Inc.

Primary upstream license:
https://github.com/ClickHouse/pg_stat_ch/blob/main/LICENSE.md

Vendored source code in the tarball includes additional third-party components:
- `third_party/clickhouse-cpp`: Apache-2.0
- `third_party/opentelemetry-cpp`: Apache-2.0
- `third_party/clickhouse-cpp/contrib/lz4/lz4`: BSD-2-Clause
- `third_party/clickhouse-cpp/contrib/zstd/zstd`: BSD-3-Clause
- `third_party/clickhouse-cpp/contrib/cityhash/cityhash`: MIT
